Feeding mechanism for sewing-machine.



No. 814,027. *Y v PATENTBD MAR. 6, 1906. P. DIEHL 6c A. GRIEB. PEEDING MEGHANISM POR SEWING MACHINES.

AP'PLIOATION FILED HABII, 1905.

PATENTED MAR. 6, 1906.

P. DIEHL & A. GRIEB. FBBDING MBGHANISM PoR 'SEWING MACHINES. MAR.11,1-905.

APPLICATION FILED 2 SHEETS-SHEET 2.

UNITED STATES PATENT OEEICE.

PHILIP' DIEHL AND ALFRED GRIEB, OE ELIZABETH, NEW JERSEY,

ASSIGNORS To THE SINGER MANUFAcTURING COMPANY, OE ELIZABETH, NEW JERSEY, A CORPORATION or NEW JERSEY.

specification of Lettersratent.

on SEWING-MAGHINES.

'Patented umn e, 190e.

Appunti aaa umh 11, 190s. we n. 24am'.

To all whom it may mmoern:

Be it known that we, PHILIP DIEHL and ALFRED GRIEB, citizens of the Umted States, residing at Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following isa specification, reference heing had therein to the accompanying draw- Io mes.

his invention relates to an improvement in differential feeding devices for puckering or crowding together the goods beneath the needle of a sewing-machine, a'nd especially x5. to such devicesas employed for overseaming the raw trimmed edges of knit goods; and it has for its object to provide a silnple and effective deviet` of this nature and to provide a greater scopeof adjustment of mechanism of zo the class described than that afforded by constructions heretofore in use.

The invention consists, primarily, in a feeding device comprising a common feedbar, to which are attached two relatively 2 5 Inovable feed-dogs, havin their roughened feeding-surfaces similarly r isposed to engage the lower surface of the Work, the one in ad vance and the other in the rearI of the needle, derivin their feeding movements from Said 3o bar am rovided with Ineans for lifting the same in( ependently into engagement with the wrk,wherebv while both feed-dogs rise to engage the work at the Sametime the rearward feed-do is retracted from engagement with the-wor before the forward feed-do so that the latter serves to feedthe goo s after the former has ceased its effective operation.

'lhe invention also includes means for ad- 4c justing independentlythe effective action of the two feed-dogs and mechanism whereby a singlecam upon the main shaft of the machine connnuncatesto the rearward feeddov both its feeding and lifting movements..

n the annexed drawings, Figure 1 is a front end view of an overseamin f sewing-machine similar to, that forming vtii e subject of United States at'ent to Philip Diehl, No. 733,170, dated Illy 7, 1903-, and embodying 5o the present invention, the work-plate and a portion of the feed-bar being shown in Section; and Fig. .2 is a lan of the same with the work-plate remove( and certain other parts in horizontal section. Fig. 3 is a transverse =,1j section of the main shaft with the main feedeccentric, and Fig.V 4is a partial longitudinal 1 sectional elevation of the same. Fig. 5 ist side view Aoi' the main feed-eccentric with the,V sliding block by which it is carried. Figgi is a transverse section of the mawin shaft, rep-6e resenting in elevation the main feed-hftbielg eccentric and its connection withthe f 7 bar. Fig. 7 is a perspective view ofthe rear-.15 ward or auxiliary. feed-dog. Fi 8 is a plan`-f-. view, u on an enlarged scale o the throatplate o the machine; and ig. 9 is 'a scc-ffl tional elevation representing the twoart presser-foot, feed-dogs, and a portion o theig` goodsA interposed between the same.

As herein represented, the machine-is provided with the base land bracket-arm 2,'in`- the forward end of which are mounted the* needle-bar 3, carrying the needle `4, andthe'. presser-bar 5, carrying the presser-foot, coni- 2,, prising the rigid heel portion 6 and offset toe 75 portion 7, connected therewith-'by rthapiv.-v`v otal pin 8 and maintained in normal'relation therewith by means of the' spring 9, housedin a suitable' socket inthe h ortion.

As in the patent before. erred to, looper 10 is mounted upon a rock-shaft journaled in the swngingcarrier 11 and provided with a crank-arm 1,2, by means of which' it receives its rocking movements from the forked vibrating arm 13, having connections uith a crank upn the main shaft of-thema- C une.

The base 1 is provided at the-rear with a bracket 14, having a air of arms the shaft 15 for the v1 ratinE'knife-arm v16,- 9e,l carrying the trimming-knife lade 17, which operates in con'unction with the stationaryv lower knife-bla e 18. The bracket 14 has a. second pair of rigid arms carrying:` center- Qq, screws 19 for the feed rock-shaft or rocker l20,v having a depending arm 21, connected with- Y one end of an eccentric-rod 22, embrcing at the o posite end the feed-actuating eccentric 23, which is mounted upon a slidin block 24',- mounted in a lateral transverse s deway the collar 25, fixed upon the main shaft 26.5 The feed cam or eccentric 23 is formed with an elongated clearance-slot 27, embracing the main shaft, and the slidingj block 24 has. upon its rear face a pair of lugs 28,'ente the annular-grooves 29 in the ead'of an a the 48o m means of a spring 31 interposed between the '55 upright arm of'thc angle-lcver45 to deterl operation of the machine as vthe point of the needle risesabove the t-hroatlplatev the feed-dogs rise simultaneously and egin their feeding movements. As the pivotal pin 52 of the feed-bar 36 and the fulcrum- 7o screw 46 of the angle-lever 45 have e ual movements derived from` rthe feed-roc er, while the pin 48 has a slower resultant horizontal movement due to its angularrelation with the pivotal members 19 and 52, it is evi- 7 5 dent that the auxiliary feed-dog 43 will begin to descend as soon as the feed of the material commences with a speed which is determined directly by the distance of the screw 48 from the lower end of the slot 47. Both members So of the resser-foot having been simultaneously li ed by the rise of the corresponding feeding members, the heel member 6 of the presserfoot falls with the auxiliary feed-dog 1n its descent, and thereby presents a shoul- 85 der offering a partial obstruction to the fabric which is still being fed forward by the prilmary feed-dog, as represented in Fig. 9, which results 1n the crowding of the fabric beneath the needle, thereby affording com- 9o pensation for the dstcndin action normally due to the compression oft 1e fabritai etiveen the presser-foot and the feed-dog, as in ordiA nary work-feeding operation, the result beingthe production of an overseamed ed e 95 upon the fabric which may be made perfect y flat. v

in practice it has been found desirable to form la slight depression in the throat-plate 53 slightly behind the needle-hole and in the roo direct line of the overseam, as at 54 in Fig. 8, whereby the pressure of the heel portion of the resser-foot upon the overseamcd edge of the abric is somewhat relieved, thereby providing for a substantially uniform pressure 105 upon the fabric both in front and in rear of the needle, notwithstanding the increased thickness of the edge resulting from the addition of the overseam.

justing-screw30, fitted to a suitably-threaded In the normal transverse aperture in the collar. The turning of the screw 30 evidently serves to move its head within the countersink therefor formed in the collar 25 and tov thereby similarly shift the block 24 to vary the eccentricity of the cam or eccentric 23, carried thereby. As shown in Fig. 4, lost motion is prevented between the relatively movable parts by bottom of a radial socket 32 in the collar 25 and the Harige 33 of an angle-piece secured to the block 24 by means of a screw 34, the spring tending to maintain a continuous engagement between the lugs 28 and the grooved head of the screw 30.

The feed rock-shaft or rocker is provided at its forward end with the usual upwardlyprojecting lugs 35, to which is pivoted one 2o end of the feed-bar 36, which is forked at its opposite end, one branch being 4pivoted to therod of an eccentric-strap 37, embracing the primary feed-lifting eccentric 38 upon the main shaft, and the other branch being extended toward the stitch-forming members, where it is provided with the forward or primary feed-dog 39, secured adjustably thereon by means of the fasteninfr-screw 40, passing through a slot 4l in the sliank of the same o and with a slideway 42, fitted to the shank of the rearward or auxiliary feed-dog 43, having a lateral notch 44, entered by the lateral arm of a two-'armed angular lever 45, pivote'd upon the fulcrum-stud 46, carried by the shank of the primaryfeed-dog 39. The forward lug35 of the feed-rocker is provided with a lateral irojection having a substantially vertical sllot 47, entered b f the adjustable pivotal screw 48, embraceif by the part 4o 49 of a two-part pitman whose other portion 5() is pivotally connected with the upright arm of the angular lever 45, the )arts 49 and 5() of the pitmanbeing adjustably connected together by means of the screw 51, passing through a slot 52 in the one and entering the other.

` ln thcuse ofthe machine the rimary feeddogi'ftis first set in its desired e ovation upon the feed-bar 36 and the feed-eccentric 23 5o adjusted to 'give the desired feeding movement tosuch primary feed-dog. 'The pivotal vscrew 4 8 is'then adjusted in its slot 47 in the rocker to or from alincment with the axis of motion of the rocker and thc upper end of the ing-surfaces of the fee -dogs rise materially above the top of the throat-plate, it will be observed that the extent of effective action of the aixilary feed-dog is determined by the distance traversed by the same in making 1r f.

its forward or feeding movement before it descends beneath the upper face of the throat late, the heel portion 6 of the presser-foot ollowing the same downwardly until arrested by contact of the sazne or the'material be- 12o neath it with the throat-plate at the edges of y the fetal-apertures when the further drop of the auxiliary feed-dog evidently becomes ineffective as regards thc'feeding operation.

From the foregoing description it lwill be x2 5 observed that the present improvement is susceptible of considerable modification in constructive features and arrangement of parts without de arting from the spirit of the invention, and it 1s therefore to he understood r 3o animfjthe point at which the, auxiliary feed- -dogjl shall ldrop mV the forward feeding movement of the feed-bar, and the mam f" 1*1 0 shalthavmg been turned to` elevato the prioo martv feed-dog 3f) toits highest position the ulengt h of'the two-part link 4950 is adjusted y"by'temporarily lorvisening the clamp-screw 51 to'hring lhclziusilimy feed-'dog to the same. level as thel primary feed-dog, when the feedingptech'anism is adjusted for operation.

As in ordinary feedin operations the feedi 1o that the invention is not limited to the spebar for communicating to said primary feedvdog feeding and lifting movements, of an auxiliary feeddog operatively connected with said feed-bar to receive feeding movements therefrom, said auxiliary feed-do having its feeding-surface presented to an adapted Vto act upon the same side of the workas that of the primary feed-dog, and means for communicating to said secondary feed-dog differentially-timed lifting moveients in respect of those of the primary feed- In a sewing-machine, the combination with a feed-bar, a primary feed-dog fixed upon said feed-bar, and an auxiliary feeddog operatively connected with said feed-bar to receive feeding movements therefrom and movable thereon crosswise of the direction'of feed, of actuating means for communicating to said feed-bar its feeding movements,

means for coinmunicatin to said feed-bar its lifting movements, an a connection between said actuating vmeans and the auxiliary feed-dog for communicating lifting movements thereto. s f

3. In a'sewin r-1nachine, tliefcombination with a feed-bar aving a slideway disposedl transversely of the direction of feed, of a primary feed-dog carried by and an auxiliary feed-dog mounted within the slideway of said feed-bar, means for communicating to said feed-bar feeding and lifting movements, and means` connected with said auxiliary feeddog for communicating thereto lifting movements independent of those of the feed-bar.

` 4. In a sewing-machine, the combination with a feed-bai,`aI primary feed-dog carried thereby, a feed-rocker to which said feed-bar is connected, and means for communicating lifting movements to said feed-bar, of an auxiliary feed-do movably connected withv and derivin fee ing movements from said feed-bar, an an inde endent connection between said auxiliaryeed-dog and the feedrocker whereby the feeding movements of ,said feed-rocker serve to 'impart the lifting movements tosaid auxiliary feed-dog.

5. In a sewing-machine, the combination with a feed-bar, means for communicating' ceding movements thereto, and two relatively movable feed-dogs disposed the onerin lcscillate in fixed bearings and anism.

advance of the other with their feeding-sm'- faces presented to and adapted te act upon the same side of the work and operatively connected with said feed-bar to receive equal feeding movements therefrom, of independent means for lifting Vsaid feed-dogs.

6. In a sewing-machine, the combination with a feed-rocker pivotally mounted in fixed bearin means for actuating it, a feed-bar, and alfieri-dog movably latter and adapted to be moved therewith in' the direction of feed, of independent connections fiom said feed-rocker to said feed-bar and feed-dog for imparting thereto respectively feeding and lifting movements.

7. In al sewin -Inacliine, the combinationv with a feed-roc er mounted toxoscillate in fixed'bearings, a feed-bar pivotally connected with and supported atone end by said feedrocker, and means for actuating said feedrocker, of a feed-dog movably connected with said feed-bar to receive feeding movements therefrom, and an adg'iustable positive conneetin between said roc ,for con'imunicatin(T to the latter lifting movements in respect di said feed-bar,

8. In asewing-machine, the combination with a feed-bar, a feed-rockei` connected with said feed-bar for which it affords a support and means for actuating said feed-rocker, o. a feed-dou inovably connected with and de riving fee ing movements from said feed-bar, and a two-armed lever fulcrumed uponsaid feed-bar and having one arm connected with said feed-dog and the other arm connected with said feed-rocker, whereby lifting movements are communicated to said feed-dog:

9. 'In a sewing-machine, the' combination with feeding mechanism comprisingtwo independently-movable feed-do and means for communicating thereto ceding movements and differential rising and .falling er and feed-dog mounted upon the l,

mounted to y IOC movements, of a two-part presser-foot havingirelatively yielding members. operating each iny con'unction with one of said feeddogs and a apted to rise and fall with the same under the action of said feeding mechwe have signed our naines to this specification in the presence ofy two subscribing witnesses.

PHLIP DIEHL. ALFRED GRIEB.

In testimony whereof Witnesses:

HnNnY J. MILLER, Neneh A, KORNEMANN. 

